Thomas mckinley



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T. MoKINLEY.

INJECTOR FOR TYPE CASTING MACHINES. I No. 268,513. Patented Deo.5.1882..

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UNITED STATES PATENT UFFICE.

THOMAS MGKINLEY, OF NEW YORK, N.

INJECTOR FOR TYPE-CASTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 268,513, dated December5, 1882.

' Application filed March 2, i882. (No model.)

To all whom it may concern:

Be it known that], THOMAS MCKINLEY, of the city, county, and State ofNew York, have invented a new and Improved Injector for Type-CastingMachines, of which the following is a full, clear, and exactdescription.

The type casting machines made heretofore have been constructed with aniron cylinder or well in which a plunger works. It is very difficult tofit the plunger so accurately that it will work well in the cylinder,and as the cylinder is heated the plunger will be too large or toosmall, and the plunger will be packed and jammed in the cylinder, or itwill be so loose that the molten metal will escape between the plungerand the cylinder, and there will not be sufficient pressure to force themolten metal into the molds to produce type of uniform solidity. l

The object of my invention is to avoid the above-mentioned defects.

Reference is to be had to the accompanying drawings, forming part ofthis specification,-in which similar letters of reference indicatecorresponding partsin all the figures.

Figure 1 is a longitudinal sectional elevation of my improved injectorfor type-casting machines. Fig. 2 is a detail sectional elevation of thewell or cylinder and diaphragm. Figs. 3 and 4 are cross-sectionalelevations of the same, showing modifications of the diaphragm.

The cylinder or well A, of the usual construction, is secured on aplate, B, resting above a fire-box, andin this plate a channel, 0, leadsfrom the bottom of the well or cylinder A to the type-casting mold,through which channel the molten metal must be injected into the molds.A diaphragm, D, made of sheet metal, is secured on the upper edge of thecylinder A, and is provided at its center with an upwardly-projectingrod, E, the upper end of which is pivoted to a pivoted lever, F, whichis worked up and down or rocked by means of a cam or some other suitabledevice. The diaphragm D is provided with a series of corru gations, G,as shown in Figs. 1 and 2; or the corrugations G may be arranged at theedges of the diaphragm, the middle portion of which is made fiat, asshown in Fig. 3; or the dia phragm can be made conical and the sides ofthe cone provided with the corrugations, as shown in Fig. 4. It thediaphragm is raised, a vacuum will be formed in the cylinder A, andmolten type-metal will pass from the reservoir on the plate B throughthe channel 0 into cylinder A. WVhen the diaphragm is depressed the airin the cylinder is compressed, and the metal is forced through thechannel 0 into the mold. The outer end of the channel 0 is provided withan automatic valve of the usual construction. The pressure on the moltenmetal will always be the same for each descent of the diaphragm, and thetypes will have uniform solidity. The heat required to keep the metal ina molten state will not affect the diaphragm, and the injectorwill notrequire adjustment or packing, and is not apt to get out of order.

If desired,'a double diaphragm may be used in place of the singlediaphragm.

Having thus fully described my invention,

what I claim as new, and desire to secure by inder or box, and admittingof sufficient vibra-

